International Tables for Crystallography

Volume G: Definition and exchange of crystallographic data

Edited by S. R. Hall and B. McMahon

Describes CIF, the data exchange standard of crystallography. Provides: information for scientists who wish to record or use the results of a single-crystal or powder diffraction experiment; the data ontology necessary for designing interoperable computer applications; accompanying software including machine-readable CIF dictionaries, libraries and utility programs.

Core dictionary (coreCIF) version 2.4.5

_reflns_number_observed

Name:'_reflns_number_observed'

This definition has been superseded and is
retained here only for archival purposes. Use instead
'_reflns_number_gt'

Definition:

The number of 'observed' reflections in the _refln_ list (not
the _diffrn_refln_ list). The observed reflections satisfy the
threshold criterion specified by _reflns_threshold_expression
(or the deprecated item _reflns_observed_criterion). They may
include Friedel-equivalent reflections according to the nature
of the structure and the procedures used. Special characteristics
of the reflections included in the _refln_ list should be given
in the item _reflns_special_details.